it is ue with us. you can combine two ideas and come up with a worse idea but no e picks i up, no one takes it off. if you come up with a better idea it seads at the expense of the baddie and the recombining and what we do. the more we trade, the more we exchange, the more it happens. >> and the better life gets in general. >>guest: absolutely. our living standards have shot up in my lifetime. the average income of the average person is throw times what it was when i was born and life span 30 percent longer and child mortality is two-thirds lower that is because we kee improvg each other's living standards. >> so, you like to show people is picture. >>guest: the object on the left is a hand a and from half a million years ago and sits on my desk at home, the hand ax and next toit is t computer mouse, and they are the same size and shape and the was madeed without a change in design for half a million years. is made from a single substance and the mouse is made from a bunch of dfferent substances, plast